|USML-1 microgravity glovebox experiment no. 1 Passive Accelerometer System - Alexander, J. Iwan D.|
The passive accelerometer system (PAS) is a simple moving ball accelerometer capable of measuring the small magnitude steady relative acceleration that occurs in a low earth orbit spacecraft due to atmospheric drag and the earth's gravity gradient. The accelerometer can be used when the spacecraft continuously rotates during the orbit such that some line of reference in the craft always points along the vector connecting the earth's mass center with the spacecraft mass center...
Keywords: HARMONIC OSCILLATORS; OSCILLATORS; QUANTUM MECHANICS; SYMMETRY; CLASSICAL MECHANICS; FORMALISM; HADRONS
|Discrete-time Markovian stochastic Petri nets - Ciardo, Gianfranc|
We revisit and extend the original definition of discrete-time stochastic Petri nets, by allowing the firing times to have a 'defective discrete phase distribution'. We show that this formalism still corresponds to an underlying discrete-time Markov chain. The structure of the state for this process describes both the marking of the Petri net and the phase of the firing time for each transition, resulting in a large state space...
Keywords: HARMONIC OSCILLATORS; ORBITS; RESONANCE; TIME DEPENDENCE; ATOMIC PHYSICS; FREQUENCIES
|Tactile discrimination and representations of texture, shape, and softness - Srinivasan, M. A.|
We present here some of the salient results on the tactual discriminabilities of human subjects obtained through psychophysical experiments, and the associated peripheral neural codes obtained through electrophysiological recordings from monkey single nerve fibers. Humans can detect the presence of a 2 micron high single dot on a smooth glass plate stroked on the skin, based on the responses of Meissner type rapidly adapting fibers (RAs)...
Keywords: HAMILTONIAN FUNCTIONS; QUANTUM MECHANICS; SQUEEZED STATES (QUANTUM THEORY); TIME DEPENDENCE; WIGNER COEFFICIENT; HARMONIC OSCILLATORS; QUADRATIC EQUATIONS
|Navier-Stokes flow field analysis of compressible flow in a pressure relief valve - Vu, Bruce T.|
The present study was motivated to analyze the complex flow field involving gaseous oxygen (GOX) flow in a relief valve (RV). The 9391 RV, pictured in Figure 1, was combined with the pilot valve to regulate the actuation pressure of the main valve system. During a high-pressure flow test at Marshall Space Flight Center (MSFC) the valve system developed a resonance chatter, which destroyed most of the valve body...
Keywords: ALGORITHMS; APPROXIMATION; HARMONIC OSCILLATORS; ORTHOGONAL FUNCTIONS; EIGENVECTORS; HAMILTONIAN FUNCTIONS; HERMITIAN POLYNOMIAL; RANDOM SAMPLING; SCHROEDINGER EQUATION
|New Ro-Vibrational Kinetic Energy Operators using Polyspherical Coordinates for Polyatomic Molecules - Schwenke, David W|
We illustrate how one can easily derive kinetic energy operators for polyatomic molecules using polyspherical coordinates with very general choices for z-axis embeddings arid angles used to specify relative orientations of internal vectors. Computer algebra is not required.
Keywords: RAMAN SPECTRA; OXIDIZERS; CALIBRATING; SCATTERING; HARMONIC OSCILLATORS; DIAGNOSIS; HIGH PRESSURE; HYDROGEN; NITROGEN; WATER; FLAMES; BURNERS; FUELS
|Characterization of zinc selenide single crystals - Gerhardt, Rosario A|
ZnSe single crystals of high quality and low impurity levels are desired for use as substrates in optoelectronic devices. This is especially true when the device requires the formation of homoepitaxial layers. While ZnSe is commercially available, it is at present extremely expensive due to the difficulty of growing single crystal boules with low impurity content and the resultant low yields. Many researchers have found it necessary to heat treat the crystals in liquid Zn in order to remove the ...
Keywords: QUANTUM MECHANICS; HARMONIC OSCILLATORS; DEGREES OF FREEDOM; QUANTUM THEORY; MATHEMATICAL MODELS
|Parallel software tools at Langley Research Center - Moitra, Stuti|
This document gives a brief overview of parallel software tools available on the Intel iPSC/860 parallel computer at Langley Research Center. It is intended to provide a source of information that is somewhat more concise than vendor-supplied material on the purpose and use of various tools. Each of the chapters on tools is organized in a similar manner covering an overview of the functionality, access information, how to effectively use the tool, observations about the tool and how it compares ...
Keywords: HARMONIC OSCILLATORS; HEISENBERG THEORY; QUANTUM MECHANICS; EIGENVECTORS; FOURIER TRANSFORMATION; HERMITIAN POLYNOMIAL
|Numerical computation of aerodynamics and heat transfer in a turbine cascade and a turn-around duct using advanced turbulence models - Lakshminarayana, B.|
The objective of this research is to develop turbulence models to predict the flow and heat transfer fields dominated by the curvature effect such as those encountered in turbine cascades and turn-around ducts. A Navier-Stokes code has been developed using an explicit Runge-Kutta method with a two layer k-epsilon/ARSM (Algebraic Reynolds Stress Model), Chien's Low Reynolds Number (LRN) k-epsilon model and Coakley's LRN q-omega model...
Keywords: ENERGY LEVELS; HAMILTONIAN FUNCTIONS; HARMONIC OSCILLATORS; CLOSED CYCLES; ENERGY SPECTRA; IDENTITIES
|Application of Twin Beams in Mach-Zehnder Interferometer - Zhang, J. X.|
Using the twin beams generated from parametric amplifier to drive the two port of a Mach-Zehnder interferometer, it is shown that the minimum detectable optical phase shift can be largly reduced to the Heisenberg limit(1/n) which is far below the Shot Noise Limit(1/square root of n) the large gain limit. The dependence of the minimum detectable phase shift on parametric gain and the inefficient photodetectors has been discussed.
Keywords: SQUEEZED STATES (QUANTUM THEORY); INTEGRAL EQUATIONS; PARTIAL DIFFERENTIAL EQUATIONS; QUANTUM MECHANICS; EIGENVECTORS; HARMONIC OSCILLATORS
|Observational studies of the clearing phase in proto-planetary disk systems - Grady, Carol A|
Progress in this study is summarized for its second year. An extensive program of high dispersion UV spectral studies using the IUE (International Ultraviolet Explorer) has resulted in acquisition of 40 Herbig Ae/Be star and related object spectra. We find that accreting, circumstellar gas is detected with velocities consistent with material in free-fall toward the stars in approximately 38 of the sample...
Keywords: ANNIHILATION REACTIONS; EIGENVECTORS; HARMONIC OSCILLATORS; HERMITIAN POLYNOMIAL; WAVE FUNCTIONS; COMMUTATION; IDENTITIES
|Aerodynamic design and analysis of a highly loaded turbine exhaust - Huber, F. W.|
The aerodynamic design and analysis of a turbine exhaust volute manifold is described. This turbine exhaust system will be used with an advanced gas generator oxidizer turbine designed for very high specific work. The elevated turbine stage loading results in increased discharge Mach number and swirl velocity which, along with the need for minimal circumferential variation of fluid properties at the turbine exit, represent challenging volute design requirements...
Keywords: COULOMB POTENTIAL; HARMONIC OSCILLATORS; QUANTUM MECHANICS; SCHROEDINGER EQUATION; PROBLEM SOLVING; TRANSFORMATIONS (MATHEMATICS); WAVE FUNCTIONS
|EOL performance comparison of GaAs/Ge and Si BSF/R solar arrays - Woike, Thomas J|
EOL power estimates for solar array designs are significantly influenced by the predicted degradation due to charged particle radiation. New radiation-induced power degradation data for GaAs/Ge solar arrays applicable to missions ranging from low earth orbit (LEO) to geosynchronous earth orbit (GEO) and compares these results to silicon BSF/R arrays. These results are based on recently published radiation damage coefficients for GaAs/Ge cells...
Keywords: FORMALISM; GROUND STATE; HAMILTONIAN FUNCTIONS; HARMONIC OSCILLATORS; MOMENTUM; QUANTUM MECHANICS; WAVE PACKETS; ANALYSIS (MATHEMATICS); CLASSICAL MECHANICS; EQUATIONS OF MOTION
|Automotive tires - Construction, design, testing, and operation - Biderman, V. L., et al|
Construction and performance of automobile tires
Keywords: HUMAN PERFORMANCE; OPTIMAL CONTROL; TASKS; LEARNING THEORY; MANUAL CONTROL; STOCHASTIC PROCESSES; CONFERENCES; DECISION MAKING; DYNAMIC CONTROL; HARMONIC OSCILLATORS; INFORMATION SYSTEMS
|The efficiency of photovoltaic cells exposed to pulsed laser light - Lowe, R. A.|
Future space missions may use laser power beaming systems with a free electron laser (FEL) to transmit light to a photovoltaic array receiver. To investigate the efficiency of solar cells with pulsed laser light, several types of GaAs, Si, CuInSe2, and GaSb cells were tested with the simulated pulse format of the induction and radio frequency (RF) FEL. The induction pulse format was simulated with an 800-watt average power copper vapor laser and the RF format with a frequency-doubled mode-locked...
Keywords: HARMONIC OSCILLATORS; MANIFOLDS (MATHEMATICS); QUADRATURES; QUANTUM MECHANICS; QUANTUM OPTICS; SQUEEZED STATES (QUANTUM THEORY); GLAUBER THEORY; HILBERT SPACE; NORMAL DENSITY FUNCTIONS
|A time-accurate finite volume method valid at all flow velocities - Kim, S.-W|
A finite volume method to solve the Navier-Stokes equations at all flow velocities (e.g., incompressible, subsonic, transonic, supersonic and hypersonic flows) is presented. The numerical method is based on a finite volume method that incorporates a pressure-staggered mesh and an incremental pressure equation for the conservation of mass. Comparison of three generally accepted time-advancing schemes, i.e., Simplified Marker-and-Cell (SMAC), Pressure-Implicit-Splitting of Operators (PISO), and It...
Keywords: COMMUTATION; FINITE ELEMENT METHOD; HAMILTONIAN FUNCTIONS; HARMONIC OSCILLATORS; MATRICES (MATHEMATICS); EQUATIONS OF MOTION; GROUND STATE; OPERATORS (MATHEMATICS); QUANTUM MECHANICS
|The human operator transfer function: Identification of the limb mechanics subsystem - Jones, Lynette A.|
The objective of our research is to decompose the performance of the human operator in terms of the subsystems that determine the operator's responses in order to establish how the dynamics of these component subsystems influence the operator's performance. In the present experiment, the dynamic stiffness of the human elbow joint was measured at rest and under different levels of biceps muscle activation; this work forms part of the analysis of the limb mechanics subsystem.
Keywords: CONJUGATES; HARMONIC OSCILLATORS; HERMITIAN POLYNOMIAL; PHASE-SPACE INTEGRAL; QUADRATIC EQUATIONS; CLASSICAL MECHANICS; FUNCTIONS (MATHEMATICS); LIOUVILLE EQUATIONS; MATRICES (MATHEMATICS)
|A study of the vortex flow over 76/40-deg double-delta wing - Verhaagen, N. G.|
A low-speed wind-tunnel study of the flow about a 76/40-deg double-delta wing is described for angles of attack ranging from -10 to 25 deg and Reynolds numbers ranging from 0.5 to 1.5 Million. The study was conducted to provide data for the purpose of understanding the vortical flow behavior and for validating Computational Fluid Dynamics methods. Flow visualization tests have provided insight into the effect of the angle of attack and Reynolds number of the vortex-dominated flow both on and off...
Keywords: DISTRIBUTION FUNCTIONS; ENTROPY; FOKKER-PLANCK EQUATION; HARMONIC OSCILLATORS; NORMAL DENSITY FUNCTIONS; QUANTUM MECHANICS; DYNAMIC STABILITY; STOCHASTIC PROCESSES; VIBRATION DAMPING
|Finite-difference solutions of the alternate turbopump development high-pressure oxidizer turbopump pump-end ball-bearing cavity flows - Benjamin, Theodore G.|
These analyses were undertaken to aid in the understanding of flow phenomena in the Alternate Turbopump Development (ATD) High-pressure Oxidizer Turbopump (HPOTP) Pump-end ball bearing (PEBB) cavities and their roles in turbopump vibration initiation and bearing distress. This effort was being performed to provide timely support to the program in a decision as to whether or not the program should be continued...
Keywords: ANNIHILATION REACTIONS; QUANTUM OPTICS; VECTORS (MATHEMATICS); WAVE FUNCTIONS; COHERENCE; HAMILTONIAN FUNCTIONS; HARMONIC OSCILLATORS; MATHEMATICAL MODELS; OPERATORS (MATHEMATICS); EQUATIONS OF STATE; FUNCTION SPACE; PHOTONS
|CFD analysis of turbopump volutes - Ascoli, Edward P.|
An effort is underway to develop a procedure for the regular use of CFD analysis in the design of turbopump volutes. Airflow data to be taken at NASA Marshall will be used to validate the CFD code and overall procedure. Initial focus has been on preprocessing (geometry creation, translation, and grid generation). Volute geometries have been acquired electronically and imported into the CATIA CAD system and RAGGS (Rockwell Automated Grid Generation System) via the IGES standard...
Keywords: ASTRONOMICAL MODELS; ANGULAR VELOCITY; POTENTIAL ENERGY; ROTATION; VELOCITY DISTRIBUTION; CAUCHY PROBLEM; ELLIPSOIDS; HAMILTONIAN FUNCTIONS; HARMONIC OSCILLATORS; KINETIC ENERGY; NUCLEAR PHYSICS; SYMMETRY; ALGEBRA
|Polyimide based amorphous silicon solar modules - Jeffrey, Frank R.|
Requirements for space power are increasingly emphasizing lower costs and higher specific powers. This results from new fiscal constraints, higher power requirements for larger applications, and the evolution toward longer distance missions such as a Lunar or Mars base. The polyimide based a-Si modules described are being developed to meet these needs. The modules consist of tandem a-Si solar cell material deposited directly on a roll of polyimide...
Keywords: CAVITIES; COMPRESSING; EIGENVALUES; HEISENBERG THEORY; QUANTUM THEORY; WIGNER COEFFICIENT; COHERENT LIGHT; DEFORMATION; ELECTROMAGNETIC FIELDS; HARMONIC OSCILLATORS; LIGHT TRANSMISSION; QUANTUM OPTICS; SQUEEZED STATES (QUANTUM THEORY); ADIABATIC CONDITIONS
|Managing Distributed Systems with Smart Subscriptions - Filman, Robert E.|
We describe an event-based, publish-and-subscribe mechanism based on using 'smart subscriptions' to recognize weakly-structured events. We present a hierarchy of subscription languages (propositional, predicate, temporal and agent) and algorithms for efficiently recognizing event matches. This mechanism has been applied to the management of distributed applications.
Keywords: SQUEEZED STATES (QUANTUM THEORY); RADIATION DISTRIBUTION; SCHROEDINGER EQUATION; ELECTROMAGNETIC FIELDS; QUANTUM OPTICS; HARMONIC OSCILLATORS; QUANTUM MECHANICS; CONFERENCES; OPTICAL MEASUREMENT; QUANTUM THEORY; LIGHT SOURCES; CORRELATION
|Neural mechanisms of kinesthesia - Clark, Francis J|
Our primary interest is in where the signals for position and movement of the limbs originate and how the information is encoded. Humans can independently sense the positions and movements of their limbs in the absence of vision, and their senses are derived from mechanoreceptors located in the limbs. Receptors in muscles, skin and joints are potential sources of position and movement signals, but how (and whether) each of these groups contributes to kinesthesia remains uncertain...
Keywords: COHERENT LIGHT; TIME DEPENDENCE; HARMONIC OSCILLATORS; HERMITIAN POLYNOMIAL; SQUEEZED STATES (QUANTUM THEORY); WAVE FUNCTIONS; HAMILTONIAN FUNCTIONS; PHOTONS; QUANTUM OPTICS; SCHROEDINGER EQUATION
|MIT 5.80 Small-Molecule Spectroscopy and Dynamics, Fall 2008 - MIT OpenCourseWare|
The goal of this course is to illustrate the spectroscopy of small molecules in the gas phase: quantum mechanical effective Hamiltonian models for rotational, vibrational, and electronic structure; transition selection rules and relative intensities; diagnostic patterns and experimental methods for the assignment of non-textbook spectra; breakdown of the Born-Oppenheimer approximation (spectroscopic perturbations); the stationary phase approximation; nondegenerate and quasidegenerate perturbatio...
Keywords: spectroscopy; harmonic oscillators; matrix; hamiltonian; heisenberg; vibrating rotor; Born-Oppenheimer; diatomics; laser schemes; angular momentum; hund's cases; energy levels; second-order effects; perturbations; Wigner-Eckart; Rydberg-Klein-Rees; rigid rotor; asymmetric rotor; vibronic coupling; wavepackets
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|MIT 8.03SC Vibrations and Waves Problem Solving Help Videos, Fall 2012 - MIT OpenCourseWare|
View the complete course: http://ocw.mit.edu/8-03SCF12Instructor: Wit BuszaThis collection includes ten problem solving help videos by Professor Wit Busza. These videos help student to learn how to approach and solve problems related to the MIT course 8.03SC Vibrations and Waves.License: Creative Commons BY-NC-SAMore information at http://ocw.mit.edu/termsMore courses at http://ocw.mit.edu
Keywords: harmonic motion, harmonic oscillators, damping, vibrations, waves, standing waves, traveling waves, electromagnetic waves, accelerated charges, radiating electromagnetic waves; waves; simple harmonic motion; superposition; forced vibrations; resonance; coupled oscillations; normal modes; vibrations of continuous systems; reflection; refraction; phase; group velocity; Optics; wave solutions to Maxwell's equations; polarization; Snell's Law; interference; Huygens's principle; Fraunhofer diffraction; gratings; musical instruments; red sunsets; glories; coronae; rainbows; haloes; X-ray binaries; neutron stars; black holes; big-bang cosmology; Atomic; Molecular; Optical Physics; Classical Mechanics; Electromagnetism